write a go solution for Description:
You are given an array a consisting of n non-negative integers.

You have to replace each 0 in a with an integer from 1 to n (different elements equal to 0 can be replaced by different integers).

The value of the array you obtain is the number of integers k from 1 to n such that the following condition holds: there exist a pair of adjacent elements equal to k (i. e. there exists some iin[1,n-1] such that a_i=a_i+1=k). If there are multiple such pairs for some integer k, this integer is counted in the value only once.

Your task is to obtain the array with the maximum possible value.

Input Format:
The first line contains one integer n (2<=n<=3*10^5) — the number of elements in the array.

The second line contains n integers a_1,a_2,...,a_n (0<=a_i<=min(n,600)) — the elements of the array.

Output Format:
Print n integers not less than 1 and not greater than n — the array with the maximum possible value you can obtain.

If there are multiple answers, print any of them.

Note:
None. Output only the code with no comments, explanation, or additional text.